When the zombie apocalypse takes place and a person finds him- or herself hiding in a forest or ravine with nothing more than a survival backpack, they could sure use the HydroBee by Burt Hamner, a 'Cleantech Mentor' based in Seattle, Washington. Although its name doesn't give much away, 'hydo' is a hint. The HydroBee by Burt Hamner is essentially a hydroelectric charger that looks like a flashlight. Highly portable, it provides enough juice to charge a pair of AA batteries in one go.
Although that might not seem that impressive at first, when out in the middle of no where with only oneself for company, a pair of batteries could provide solace in a variety of ways. Thus, the HydroBee by Burt Hamner is an invaluable tool, and not just for an apocalypse situation.